needle valve

noun Machinery.
a valve with a needlelike part, a fine adjustment, or a small opening, especially a valve in which the opening is controlled by a needlelike or conical point that fits into a conical seat.

Origin:
1900–05

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
needle valve
 
n
a valve containing a tapered rod that can be moved in or out to control the flow of a fluid

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Open high side bleed needle valve on test kit bleeding the air from the high
  hose.
Valves which use a needle valve to seal the orifice shall not be acceptable.
The gas was sent from the column through a needle valve where the pressure was
  reduced to atmospheric.
Protect a gauge subject to pressure surges or cyclic pulses by installing a
  needle valve or orifice for damping.
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